Later this month (18th April) there'll be a special meeting of the City Council. It's been called, to discuss various threats to green space in the City, by the Lib Dems. It's at the Town Hall and starts at 5pm.
The Council's constitution allows special meetings to be called on particular subjects but it's actually quite rare that they happen.
Here is a link to the blog written by Lib Dem Leader Councillor Richard Kemp which explains what's being discussed and how people can get in.